package com.future.baselib.pay;



import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Random;

public class OrderInfoUtil {

	/**
	 * 生成订单信息
	 * @param price  价格
	 * @param subject 产品描述
	 * @return
	 */
	public static String buildOrderContent(double price,String subject){
		return "{\"timeout_express\":\"30m\"," +//订单存在时间
				"\"product_code\":\"QUICK_MSECURITY_PAY\"," +//支付方式（快捷支付）
				"\"total_amount\":\"" + price + "\"," +//金额
				"\"subject\":\"" + subject + "\"," +//订单信息
				"\"body\":\"我是测试数据\"," +
				"\"out_trade_no\":\"" + getOutTradeNo() +  "\"}";
	}

	/**
	 * 构造支付订单参数列表
	 * @param app_id
	 * @param rsa2
	 * @return
	 */
	public static Map<String, String> buildOrderParamMap(String app_id,String biz_content,boolean rsa2) {
		Map<String, String> keyValues = new HashMap<String, String>();

		keyValues.put("app_id", app_id);

		keyValues.put("biz_content",biz_content);
		
		keyValues.put("charset", "utf-8");

		keyValues.put("method", "alipay.trade.app.pay");

		keyValues.put("sign_type", rsa2 ? "RSA2" : "RSA");

		SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
		keyValues.put("timestamp", format.format(new Date()));

		keyValues.put("version", "1.0");
		
		return keyValues;
	}
	
	/**
	 * 构造支付订单参数信息
	 * 
	 * @param map
	 * 支付订单参数
	 * @return
	 */
	public static String buildOrderParam(Map<String, String> map) {
		List<String> keys = new ArrayList<String>(map.keySet());

		StringBuilder sb = new StringBuilder();
		for (int i = 0; i < keys.size() - 1; i++) {
			String key = keys.get(i);
			String value = map.get(key);
			sb.append(buildKeyValue(key, value, true));
			sb.append("&");
		}

		String tailKey = keys.get(keys.size() - 1);
		String tailValue = map.get(tailKey);
		sb.append(buildKeyValue(tailKey, tailValue, true));

		return sb.toString();
	}
	
	/**
	 * 拼接键值对
	 * 
	 * @param key
	 * @param value
	 * @param isEncode
	 * @return
	 */
	private static String buildKeyValue(String key, String value, boolean isEncode) {
		StringBuilder sb = new StringBuilder();
		sb.append(key);
		sb.append("=");
		if (isEncode) {
			try {
				sb.append(URLEncoder.encode(value, "UTF-8"));
			} catch (UnsupportedEncodingException e) {
				sb.append(value);
			}
		} else {
			sb.append(value);
		}
		return sb.toString();
	}
	
	/**
	 * 对支付参数信息进行签名
	 * 
	 * @param map
	 *            待签名授权信息
	 * 
	 * @return
	 */
	public static String getSign(Map<String, String> map, String rsaKey, boolean rsa2) {
		List<String> keys = new ArrayList<String>(map.keySet());
		// key排序
		Collections.sort(keys);

		StringBuilder authInfo = new StringBuilder();
		for (int i = 0; i < keys.size() - 1; i++) {
			String key = keys.get(i);
			String value = map.get(key);
			authInfo.append(buildKeyValue(key, value, false));
			authInfo.append("&");
		}

		String tailKey = keys.get(keys.size() - 1);
		String tailValue = map.get(tailKey);
		authInfo.append(buildKeyValue(tailKey, tailValue, false));

		String oriSign = SignUtils.sign(authInfo.toString(), rsaKey, rsa2);
		String encodedSign = "";

		try {
			encodedSign = URLEncoder.encode(oriSign, "UTF-8");
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}
		return "sign=" + encodedSign;
	}
	
	/**
	 * 要求外部订单号必须唯一。
	 * @return
	 */
	private static String getOutTradeNo() {
		SimpleDateFormat format = new SimpleDateFormat("MMddHHmmss", Locale.getDefault());
		Date date = new Date();
		String key = format.format(date);

		Random r = new Random();
		key = key + r.nextInt();
		key = key.substring(0, 15);
		return key;
	}

}
